Answer:
C. Farmers overproducing farm crops
Step-by-step explanation:
During the 1920's, the agricultural sector in the United States was over-producing crops for several years in a row. The farmers had their intentions to supply the US market in total, but also to have enormous amounts for export, thus to earn much more money. That actually turned to backfire, as they actually produced much more than what the US market demanded, and what was demanded for export. The prices went significantly down, so instead of profit, the farmers recorded losses. The economy crumbled because of this too, with big inflation emerging, and very big economic downfall, with the end result being the Great Depression.